how to set TCP keepalive?

[Bill Yan]

hello,

we are porting our linux program to native client. we need to set keepalive for a tcp socket. on linux, the following code works:

    int32_t optval;
    socklen_t optlen = sizeof(optval);
    optval = 1;
    setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &optval, optlen);
#ifndef NACL_PNACL
    const uint32_t keepaliveProbeCount = 20;
    optval = keepaliveIntervalSec;
    setsockopt(sockfd,  SOL_TCP, TCP_KEEPIDLE, &optval, optlen);
    setsockopt(sockfd,  SOL_TCP, TCP_KEEPINTVL, &optval, optlen);
    optval = keepaliveProbeCount;
    setsockopt(sockfd,  SOL_TCP, TCP_KEEPCNT, &optval, optlen);
#endif

#endif

with native client however, it complains that TCP_KEEPIDLE, TCP_KEEPINTVL TCP_KEEPCNT, SOL_TCP are undefined. 

I guess the reason is because native client is using newlib, instead of glibc.

I tried to find an example of setting keep alive everywhere, but couldn't.

I tried to hardcode TCP_KEEPIDLE myself and use IPPROTO_TCP. doesn't work either.

I tried the BSD (mac os) method:

    setsockopt(sockfd, SOL_SOCKET,  SO_KEEPALIVE, &on, sizeof(on));
    setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPALIVE, &secs, sizeof(secs));

doesn't work too.

could you please show me a working example?

[Sam Clegg]

Hi bill,

The socket API the chrome exposes currently does support keepalive
option. The current options are documented here:
https://developer.chrome.com/native-client/pepper_dev/c/group___enums#ga1557c0bbce8739a3418e6027a9c44e12.

While we could add the missing constants the headers, and your code
would then compile, setting these options at runtime is currently not
possible.

cheers,
sam

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[Biba Biba]

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18.09.2014 6:16 пользователь Sam Clegg <s...@chromium.org> написал: